Aqua/AIRS L2 Near Real Time (NRT) Cloud-Cleared Infrared Radiances (AIRS-only) V7.0 at GES DISC
The Atmospheric Infrared Sounder (AIRS) Level 2 Near Real Time (NRT) Cloud-Cleared Infrared Radiances (AIRS-only) product (AIRS2CCF_NRT_7.0) differs from the routine product (AIRS2CCF_7.0) in four ways to meet the three hour latency requirements of the Land Atmosphere NRT Capability Earth Observing System (LANCE): (1) The NRT granules are produced without previous or subsequent granules if those granules are not available within 5 minutes, (2) the predictive ephemeris/attitude data are used rather than the definitive ephemeris/attitude, (3) if the forecast surface pressure is unavailable, a surface climatology is used, and (4) no ice cloud properties retrievals are performed. The consequences of these differences are described in the AIRS Near Real Time (NRT) data products document. The Atmospheric Infrared Sounder (AIRS) is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. In combination with the Advanced Microwave Sounding Unit (AMSU) and the Humidity Sounder for Brazil (HSB), AIRS constitutes an innovative atmospheric sounding group of visible, infrared, and microwave sensors. This product is produced using AIRS IR only because the radiometric noise in AMSU channel 4 started to increase significantly (since June 2007). Cloud-Cleared Radiances contain calibrated, geolocated channel-by-channel AIRS infrared radiances (milliWatts/m2/cm-1/steradian) that would have been observed within each AMSU footprint if there were no clouds in the FOV and produced along with the AIRS Standard Product, as they are the radiances used to retrieve the Standard Product. Nevertheless, they are an order of magnitude larger in data volume than the remainder of the Standard Products and, many Standard Product users are expected to have little interest in the Cloud Cleared Radiance. For these reasons they are a separate output file. The AIRS2CCF_NRT_7.0 products are stored in files (often referred to as "granules") that contain 6 minutes of data, 30 footprints across track by 45 lines along track.
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| Spatial Extent: | Bounding Rectangle: N: 90 S: -90 E: 180 W: -180 |
Data Format(s): | Distribution: HDF-EOS |
| Temporal Extent: | Platform(s): | Aqua | |
| Data Center(s): | NASA/GSFC/SED/ESD/GCDC/GESDISC | Instrument(s): | AIRS |
| Version: | 7.0 | ||
- Title: Aqua/AIRS L2 Near Real Time (NRT) Cloud-Cleared Infrared Radiances (AIRS-only) V7.0
- Version: 7.0
- Creator: AIRS project
- Publisher: Goddard Earth Sciences Data and Information Services Center (GES DISC)
- Release Date: 2019-12-15T00:00:00.000Z
- Linkage: https://disc.gsfc.nasa.gov/datacollection/AIRS2CCF_NRT_7.0.html
- READ-ME: https://docserver.gesdisc.eosdis.nasa.gov/public/project/AIRS/Overview_of_AIRS_Products_and_Documentation.pdf, Overview of the AIRS Mission: Instruments, Processing Algorithms, Products, and Documentation
- USER'S GUIDE: https://docserver.gesdisc.eosdis.nasa.gov/public/project/AIRS/V7_L2_Product_User_Guide.pdf, AIRS/AMSU/HSB Version 7 Level 2 Product User Guide
Collection Information
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Purpose
The Near Real Time (NRT) product is for users whose primary interest is the low latency for data availability. While standard data products are available within 3 days of observation, NRT data are usually available within 3 hours of observation. -
DOI
10.5067/964DYFSEQVUB
- Search for granules from this collection
Data Identification
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Processing Level
2
- Quality This product is similar to AIRS2CCF.7.0 but differs in four ways to meet the three hour latency requirement of the Land Atmosphere NRT Capability Earth Observing System (LANCE).For additional information about NRT processing see either the Related URL section or the Publication References section for the V7 NRT memo. This product contains a flag for each radiance frequency indicating the quality. The three options for this quality flag are: 0 for best quality, 1 for good quality, 2 for do not use. A limitation of this product is in scenes with low contrast between the nine AIRS footprints the cloud clearing determination is poorer. Also in scenes with clouds above an inversion the warmest footprint is not necessarily the clearest.
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Collection Progress
Active
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Use Constraints
The Earth Observing System Data and Information System (EOSDIS) data use policy for NASA data can be accessed at https://earthdata.nasa.gov/earth-observation-data/data-use-policy. For information on how to properly cite and acknowledge data from the NASA GES DISC, refer to https://disc.gsfc.nasa.gov/information/documents?title=data-policy.
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Access Constraints
You must register using the EOSDIS User Registration System in order to access LANCE NRT AIRS data. You can register at https://urs.eosdis.nasa.gov/users/new
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Title: Retrieval of Atmospheric and Surface Parameters From AIRS/AMSU/HSB Data in the Presence of Clouds
Publication Date: 2003-04-29
Author(s): Joel Susskind, Christopher D. Barnet, and John M. Blaisdell
Series: IEEE Transactions on Geoscience and Remote Sensing
Volume: 41
Issue: 2
Pages: 390-409
DOI: 10.1109/TGRS.2002.808236
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Title: Improved methodology for surface and atmospheric soundings, error estimates, and quality control procedures: the atmospheric infrared sounder science team version-6 retrieval algorithm
Publication Date: 2014-03-31
Author(s): Joel Susskind, John, M. Blaisdell, and Lena Iredell
Series: J. Appl. Rem. Sens.
Volume: 8
Issue: 1
Pages: 34
DOI: 10.1117/1.JRS.8.084994
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Title: AIRS Near Real Time (NRT) data products
Author(s): Thomas Hearty, Feng Ding, Ed Esfandiari, Andrey Savtchenko, Michael Theobald, Bruce Vollmer, Xin-Min Hua, Evan Manning, and Edward Olsen
Data Dates
| Creation | |
| Last Revision |
Metadata Associations
| Association Type | Entry ID | Description | Version |
|---|---|---|---|
| Science Associated | AIRS2CCF_NRT | 7.0 |
Publication References
Related URLs
Other Descriptive Keywords
Ancillary Keywords
- CALIBRATED
- EOSDIS
- GEOLOCATED
- INFRARED
- RADIANCE
- LANCE
- NRT
- RELATIVE_START_DATE: -7
ISO Topic Categories
- IMAGERY/BASE MAPS/EARTH COVER
Acquisition Information
Projects
| Project Short Name | Campaigns | Project Dates |
|---|---|---|
| Aqua | No campaigns listed. | No dates provided. |
| LANCE | No campaigns listed. | No dates provided. |
Temporal Information
Spatial Information
| Coverage Type | Zone Identifier | Geometry | Granule Representation |
|---|---|---|---|
| HORIZONTAL | CARTESIAN | CARTESIAN |
Location Keywords
- GEOGRAPHIC REGION
- GLOBAL
Data Centers
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NASA/GSFC/SED/ESD/GCDC/GESDISC
ARCHIVERGoddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA
This data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
Data Contacts
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LENA IREDELL
Metadata AuthorLENA IREDELL
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GES DISC NASA Goddard Code 610.2
Greenbelt, MD 20771
301-286-9773
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GES DISC HELP DESK SUPPORT GROUP
Data Center ContactGES DISC HELP DESK SUPPORT GROUP
NASA/GSFC/SED/ESD/GCDC/GESDISC-
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, MD 20771
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Archive And Distribution Information
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Format: HDF-EOS
Format Type: Native
Media: Online Archive
Fees: None